Previously when I went backpacking, the vehicle I left behind at the trail head was, erm, not particularly worth stealing. I'm looking at new vehicles now, and somewhere in the back of my mind is "do I really want to leave this unattended at a trail head for 3-5 days?".

I don't like the idea of getting dropped off and picked up -- if there is an injury, weather emergency, or other problem I'd rather be able to bug out as soon as we reach the trail head. I'm aware that nothing will stop a professional thief; I'm more concerned about the passing opportunist.

Where? I suspect the answer depends on whether the trail head is in a high-crime area, what country it's in, etc.
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Joel Spolsky♦Jun 22 '11 at 23:01

@Hedge: Do you possibly mean hiking rather than backpacking? Backpacking is about "Independent budget travel, typically using a backpack for luggage and staying in shared accommodation such as hostels rather than hotels." So where you talk about trail heads I think you're actually going bushwalking or such - should we change the tags and wording a bit?
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hippietrailDec 22 '11 at 7:52

7 Answers
7

If at all possible, park near other
cars. The proximity of other cars
means that any potential thief not
only has to watch for you returning,
but also the owners of any of the
other cars.

An active alarm, preferably with a
highly visible red light blinking in
a prominent location. These tend to
get ignored when they go off in urban
areas simply because they are so
common. In isolated areas, though,
the noise they make stands out quite distinctly.
While you might be so isolated that
no one is likely to hear it, the
potential thief won't be as certain.

A passive security device helps. As
Matthew Read suggested, the Club is a
highly visible deterrent. However, a
hidden "Kill Switch" that prevents
the car from starting altogether is
much more effective.

If you're only worried about them stealing the car and not the contents I would remove the distributor cap. or depending on the way the engine is mounted swap the spark plugs with place holders. Either way you do this you need to keep them completely dry when you're hiking. The removal of either will stop the car from starting and I doubt any thief would be or professional would carry with them the required parts to fix this.

If you're worried about the contents, park the car at the local town (assuming there is one) and pay the local store / garage to taxi you to and from the beginning of your trail (assuming you have a mountain radio or cellphone reception to request a pick up on the way out.)

Here's some piece of advice which should be applicable to situations when you have to leave your car in an area with high theft/burglary rates. Some good advice can be found in other answers to this question, but here are some social engineering measures you might take (see also the answer of Jonathan VM).

Hide in plain sight. Don't attract attention -- as easy as this. Remove everything from the front and back seats, and any kinds of stands for GPS, mobile, or other equipment worth stealing. If you have a car radio, remove it as well and leave the hole wide open and visible to show there's nothing in there.

You might actually want to purposefully worsen the condition your car is. If you have a nice natural leather interior, cover the seats with some ragged blankets. Put on a pair of fuzzy dice -- the tackier, the better. Your car needs to look as if it's not worth stealing, and also not worth breaking into.

Park behind a more expensive car than yours. This of course depends on what car you drive. Good luck doing that if you have a Lexus, but if you sport a Ford, parking behind a BMW would surely draw attention away from your car, all other things being equal.

Don't park in isolated places. This is somewhat related to my previous point. A lone car in a parking lot would draw attention instantly -- even if they eventually decide not to steal it at all.

Most of these measures can also be used when leaving your car for a shorter period, but if you want to leave it for more than a few days, some "hardware" solution to prevent starting the car would also be a good idea.

Good points, but make sure that the BMW you are parking behind does not have a sophisticated alarm system, which might result in your car being focused because of the lack of such sophistication
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andraDec 20 '11 at 12:46

It was pretty common at the trailheads I've used (Northern Ontario, a hundred miles or more from any house) to see keys left in the cars and the cars unlocked. Sometimes the key would be left dangling from an external lock. The people who were doing this were basically saying "look, if you drive all the way up here and there's something in my car you want, I realized you're going to get it. I'd rather not deal with a smashed window on top of that." Also, they were preventing the possibly fatal problem of losing their keys at the bottom of a river and being unable to drive home.

Assuming you're not comfortable with that, remove and hide your GPS and its mounting brackets (and clean the "mounting brackets were here" marks.) Put everything out of sight so that the opportunist won't get inspired to smash your window. That includes your phones and other electronics you chose not to take on the trail, a large quantity of coins (we have 1 and 2 dollar coins, so $10+ is easy to have lying around visible), and anything that suggests your vehicle belongs to someone with plenty of money. If you have a suit hanging up in the back to change into when you get back to the car, you're probably one of those people who keeps $100 cash in the car for emergencies. Don't look like that and it's less likely to be a problem.

I think that's one reason why "key in the lock" works. I think it says "go ahead, look around, there's nothing for you here" and the opportunist knows the more cars they look in, the more likely they are to be caught, so they decide not to waste their time on that car, which must be pretty empty.

Some great answers here, but sometimes the best deterrent is a little bit of clever social engineering. My suggestion is to add to any of the solutions above...

A prominent note on the dashboard saying "Back in 10 minutes. - George"

Make sure "George" is some obviously male name. Without getting into the rightness or wrongness of gender stereotypes, it'll be perceived as more intimidating if it's a guy who could be back at any moment.

And of course, in foreign countries you'll need to translate it to the local language.

Edited to add:

Above all, since nothing will be a 100% solution, please be sure to...

Insure your car

Have a way to call for help (Cell phone that works at the trailhead, satellite phone, rescue beacon, something...)

Even though the chances of anything happening to your car are slim, nothing would be worse than that moment standing at a backcountry trailhead and realizing you have no way home and no way to call for assistance.

Why would anyone leave a note like this on the dashboard? This is almost like an invitation for someone to spy on it for some time and then hijack it.
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mindcorrosive♦Dec 19 '11 at 22:48

2

How is it more of an invitation than the car being parked unattended in the first place? The OP clearly said "I'm aware that nothing will stop a professional thief; I'm more concerned about the passing opportunist." This is about deterring the threshold cases, not complete prevention. And FWIW I have left exactly such a note before...sometimes you travel with someone who likes to go off and do his own thing.
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Jonathan Van MatreDec 19 '11 at 22:52

Two words - "Attracting attention". Hiding in plain sight is sometimes the best defence, IMO. Besides, leaving a note before and not having your car stolen is not a proof that this method works.
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mindcorrosive♦Dec 19 '11 at 22:53

Someone driving by is not going to see the note. If they're close enough to spot it, attention has already been attracted. You're correct that one anecdotal account is not rigorous proof, but you've also offered no proof of your theory. Unless there's psychological research on this method of psychological deterrence, I don't think we're going to resolve this dispute. +1 for a valid alternative viewpoint and I'll leave it at that.
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Jonathan Van MatreDec 19 '11 at 23:06

3

Fair enough. I think this could actually be a good fit for Skeptics-SE.
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mindcorrosive♦Dec 19 '11 at 23:17

My '89 Ford had some relays (?) in an easy accessable box under the hood, and without them the spark plugs and the starter wouldnt get any power at all. Those relays are easy to remove and to plug back in (but you should mark them so you put them back in the right place) and rather small, so i usually took them out when i left my car somewhere over an extended period of time.

Taking some important fuses out of the fusebox can have the same effect on your car.

When i parked in a dodgy area overnight i asked someone else to block my car, so you couldn't drive it away without moving another car first.